Function from_patterns_with_policy 

pub fn from_patterns_with_policy<Extra, V>(
    classifier: &GraphClassifier<Extra, V>,
    policy: &ReconciliationPolicy<V::MergeStrategy>,
    patterns: impl IntoIterator<Item = Pattern<V>>,
) -> PatternGraph<Extra, V>
where
    V: GraphValue<Id = Symbol> + HasIdentity<V, Symbol> + Mergeable + Refinable + PartialEq + Clone + 'static,
    Extra: 'static,

Builds a graph from an iterable of patterns using the given policy.